I've just loaded the new Arducopter 2.7.3 in my Octocopter and now it doesn't give the motors enough throttle to lift off the ground . It was flying fine before ; I've calibrated the ESC's again and no difference .What's going wrong ? 

 I've loaded the new 2.6 firmware into my APM 2 and it has MAVlink 1.0 on it . When connecting the board the APM Planner tells me the APM 2 is mav 1.0 and the Planner is 0.9 and to update it to mav 1.0 . I've downloaded and reinstalled the software…